0x800A0046 Error (permission denied)

I don't know what to do.
I wrote a simple function that is supposed to delete or overwrite files using filesystemobject.
I connected it with using freeaspupload. If the uploaded file is ok, it is being moved to another place and renamed. If a file of particular name exists, it is overwritten. If the uploaded file is not ok, it is deleted.
The funny thing is that the uploaded file is deleted without any problems but no files are being overwritten...
I know it has something to do with permissions, but I'm a complete beginner.
Could anyone describe me step-by-step how to set delete permissions? I've tried to do it, but i dont know what to do. please help me!

Easiest is to log on the web server as an administrator and use windows explorer. Right-click a folder and click the security tab. You can set permissions for the folder from there.

I've set all permissions to enable writing, I've turned of the read-only attribute. And still, it reacts the same way.

The thing is that I've got two folders: photos and its subfolder, temp.
Someone uploads the file to temp (I used freeaspupload as I mentioned). Then the script uses another class to check if it's an image or not and if it's big enough. If it's not, there is no problem with deleting it. When it's ok, it is moved to photos and renamed to a login name and extension (e.g. tptak.jpg). It also works when there is no other tptak.jpg in photos. If there is one it is supposed to delete it first. And here the problems start - it doesn't.

If someone has any idea about what the problem might be, please help! It's my trainee programme and I am supposed to make an address book whith photos. But I'm stuck with this thing.

I've looked around and tested fiew things. It turns out that temp has delete permissions and photos doesn't. Are there any commands in asp that may change them? It's really strange... I don't know how to make it work.
Maybe free asp upload has some commands that may do it? cause I haven't changed a single thing when I started using it and it works like a dream. Also freshly uploaded files can be deleted without any problems. But when I try to delete or move file moved from temp to photos, it says "permission denied".